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Research Papers: Gas Turbines: Structures and Dynamics

Test Results and Analytical Predictions for MIL-STD-167 Vibration Testing of a Direct Drive Compressor Supported on Magnetic Bearings

[+] Author and Article Information
Lawrence A. Hawkins

Calnetix Technologies,
16323 Shoemaker Avenue,
Cerritos, CA 90703
e-mail: lhawkins@calnetix.com

Rasish K. Khatri

Calnetix Technologies,
16323 Shoemaker Avenue,
Cerritos, CA 90703
e-mail: rkhatri@calnetix.com

Koman B. Nambiar

YORK® Navy Systems,
Johnson Controls,
631 S. Richland Avenue,
York, PA 17403
e-mail: koman.b.nambiar@jci.com

Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 27, 2014; final manuscript received August 26, 2014; published online December 2, 2014. Editor: David Wisler.

J. Eng. Gas Turbines Power 137(5), 052507 (May 01, 2015) (8 pages) Paper No: GTP-14-1441; doi: 10.1115/1.4028684 History: Received July 27, 2014; Revised August 26, 2014; Online December 02, 2014

External vibration testing was performed on a semihermetic, direct drive compressor on magnetic bearings intended for U.S. Navy Shipboard use. The compressor was placed on a U.S. Navy MIL-STD-167 shaker platform and driven at sinusoidal frequencies from 4 to 33 Hz at graduated displacements equal to a maximum of 1.5 Gs. During the machine design phase, a linear forced response analysis of the coupled rotordynamic system model of the rotor, housing, and magnetic bearings was performed to predict rotor/housing displacements and actuator loads. The results were used to guide bearing sizing and control algorithm design. The measured rotor motion and actuator currents correlated well with predictions at all tested frequencies, amplitudes, and orientations. Analysis methodology, test results, and comparisons are reported here.

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Figures

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Fig. 1

HES-C compressor mounted on the shaker table

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Fig. 2

General assembly of radial Brg 1 (nonthrust end)

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Fig. 3

Rotor/housing/magnetic bearing system model

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Fig. 4

Magnetic bearing force/displacement transfer functions for Brg 1, Brg 2, and axial bearing

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Fig. 5

Nominal housing absolute displacement due to frequency dependent excitation force per MIL-STD-167

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Fig. 6

Predicted Brg 2 rotor/housing relative displacements due to MIL-STD-167 frequency dependent excitation force

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Fig. 7

Predicted Brg 2 reaction loads due to MIL-STD-167 frequency dependent excitation force

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Fig. 8

Measured housing vibration during shaker table testing

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Fig. 9

Measured and predicted rel. rotor/housing displacement at Brg 1 position sensors using measured housing vibration as input

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Fig. 10

Measured and predicted relative rotor/housing displacement at Brg 2 position sensors using measured housing vibration as input

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Fig. 11

Measured and predicted net loads at Brg 1 and Brg 2 using measured housing vibration as input

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Fig. 12

Measured and predicted relative rotor/housing

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Fig. 13

Measured and predicted actuator force at the thrust bearing using measured housing vibration as input

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